canfield



No. 625,640. Patented Mayr23, |899. F.`P. CANFIELD. MEANS FOB AUTOMATICALLY OPENING 0R CLOSING FURNACE-OR STOVE DAMPERS.

(Application med Jan. 26, 1897.)

(No Model.)

2 Sheeis-$heet l.

.Tus ohms Emis co., PH'UmLITHO., wAsmNc'roN. u. c.

" Patented May4 23, |8919. F. P. CANFIELD.

MEANS FUR AUTOMATICALLY OPENING 0R LUSING FURNACE 0R STOVE DAMPERS.

(Application led Jan. 26, 1897.)

2 Sheets-Sheet 2.

(N0 Model.)

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, NrrnnV STATES i PATENT OFFrCE.

FELIX P. OANFIELD, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE MAGEE FURNAOE COMPANY, OF SAME PLACE.

MEANS FOR AUTOMATICALLY OPENING OR CLOSING FURNACE OR STOVE DAMPRS.

SPECIFICATION forming part of Letters Patent 1\1'o..525,640,` dated May 23, 18.99.

` Application filed January Z6, 1897. Serial No. 620,788. (No model.) l

To all whom t may concern.-

Be it known that I, FELIX P. CANFIELD, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Means for Automatically Opening or Closing Furnace or Stove Dampers, of which the following is a full, clear, and exact description, reference beinghad to the accompanying drawings, forming a part of this specification, in explaining its nature.

The invention comprises the hereindescribed means for automatically opening and closing the main damper in the direct smoke escape or passage from the combustion-charnber upon the opening and closing of the door to the combustion-chamber. v

In the drawings, Figure l is a View in front elevation of the upper part of a furnace having the features of my invention. Fig. 2 is a view in horizontal section through the furnace to s how the damper, the damper-operating rod, and its connection with the door to the coinbustionfchamber. Fig. 3 is a view upon the same section, representing the position of the parts when the combustion-chamber door is open. Fig. 4 is a detail View, partly in section and partly in elevation, representing especially a removable connection between the damper-operating rod and its actuating-lever. Figs. 5 and 6 represent means for adjusting the damper-operatin g rod in respect to the end of the operating-lever.

A represents the combustion-chamber of a furnace, and B the door opening and closingl the inlet thereto.

C is the direct smoke passage or escape from the combustion-chamber. 5

D is the damper for closing and opening the same.

cl is the damper-spindle, the turning of which turns the damper. It has at its"outer end an arm d', which is adapted to be moved by a push-and-pull rod d2, the end of which extends to the point d3 on the outer side of the front casing of the furnace. This pushand-pull rod is connected with the furnacedoor by means of a lever E, pivoted to the front casing at e immediately above the combustion chamber door, extending horizontally from its pivotal point and having an upwardly-extending end e', which engages the outer end of the push-rod, preferably by me ans of a removable connection, but not necessa# 'rily so.

The furnace-door B carries near its hinged end b an upwardly-extending arm which is attached to the door and movable with it and lthe upper endof which enters a longitudinal slot e2 in the lever E. This slot is so formed that upon the opening of the door B the outer end of the lever is caused to be moved outward, drawing the rod d2 forward and causing the damper to be turned in the escapepassage to open it and to also cause a reversal of said movementsn to take place upon the closing of the door, whereby the rod d2 is pushed inward and the damper closed.`

I have represented the connection between the section e' of the lever and the outer end of the push-rod as obtained by a removable extension F of the lever E, which has the hole f extending upward from its lower end and adapted to receive the upper end e of the said lever, the union between the two being accomplished by this means and the removable end making the connection between the lever and the push-rod. The removal of this removable end breaks the connection between the two and permits the rod to be moved by hand. By providing the end of the push-rod with aseries of holes G, as represented in Figs. 5 and 6, the position of the damper in respect to the lever E may be varied, so that when the door B is closed the damper may not be entirely closed, but may still be left open to any desired extent. Generally, however, if left open at all it should be but very slightly so.

The value of the invention consists in the fact that upon the opening of thedoor to the combustion-chamber the smoke-escape passage is simultaneously opened, a draft immediately established, and gases and ashes drawn from the combustion-chamber thereby, thus preventing the escape of gas, ashes, and dust into the furnace-room through the main entrance to the combustion-chamber. Another advantage arises from the fact that upon the closing of the door the damper is also automatically closed or partly closed, thus doing away with the liability of accident and burning out of the furnace from accidentally leaving the draft wide open.

This invention is of course equally applicable to all types of furnaces and to stoves as Well.

It will be seen that4 the connections between the door B and the outer end of the push-andpull rod are upon the outside of the furnacecasing and are readily attached thereto and to the door and that they can readily be applied to furnaces and stoves in use, as well as to new work.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States-f 1. The combination in a furnace or stove of a damper in the main smoke-Hue of the furnace or stove, a door to the combustion-chamber thereof, a lever pivoted to the casing of the furnace at a point over thev latch of the door, the said lever having the long, curved slot e2, a pin b attached to the upper edge of said combustion-chamber door and entering the said slot, the damper-spindle d, the lever d thereon, the rod cl2 extending from said le- 2. The combination in a furnace or stove of i a damper in the main smoke-flue of the furnace or stove, a door to the combustion-chamber thereof, a lever pivoted to the casing of the furnace at a point over the latch of the door, the said lever having the long, curved slot e2, a pin b attached to the upper edge of said combustion-chamber door and entering the said slot, the damper-spindle d, the lever d thereon, the rod d2 extending from said lever through the furnace to a point without the case, and -a removable connection F adapted to detachably engage the end of the rod d2 with the moving end of said slotted lever, as and for the purposes set forth.

FELIX P. CANFIELD.

itnessesz F. F. RAYMOND, 2d, K. T. BUTLER.. 

